Early 2006 model won't run but has power

Hi all, have looked through and can't find my exact fault appearing.

Unit is. 2006 model 1,1 only ever upgraded the ram to 5gb from original 1gb(2*512mb) ran fine for years like this with new ram in. Recently it was taking ages to restart unit. Press power button and white light would come on for few seconds then flash continually no display, no start up chime no extra fan noise.

Tried replacing with new ram this did nothing. Ran with casing off and checked diognosis LEDs when pressed the diognosis button lights up the trickle and the powr light only. Any thoughts on where to go next as don't want to end up buying all new internals if not needed

Hi machead3 thanks so much for taking the time to respond to me. I have tried to reset to SMC by leaving unplugged overnight then pressing the SMC button (both unplugged and plugged) this did nothing at all.
I've tried to boot to hardware test via holding down D and by manually ejecting disk drive and putting original software disks in. Nothing has worked.
One thing I have noted is that when SMC BUTTON is pressed then released the CPUA & CPUB OVERTEMP LIGHTS flash once red then turn off. --- not sure that is relevant just want give as much info as possible.
I have now removed cd tray and cd, graphics card, HDD's, and both RAM risers and the internal clock battery, but am at a loss to know what the problem is, any and all advise greatly appreciated :)

2 Answers

Reset the SMC.Leave unplugged for overnight reset the SMC, try to boot. This could be a bad HD, the PSU, Graphics Card or a logic board issue. Boot to Hardware Test to begin eliminating some variables report what it says.

If this Answer is helpful please remember to return and mark it Accepted.

There are ''diagnostic lights on the RAM riser cards'' (where the RAM plugs in). Each RAM stick has a little LED. If the LED remains red after booting, then there may be a problem with that RAM stick or with the RAM slot.

I think if you are not getting any beep codes/flashing lightsthe logic board or EFI is bad. When you attempted to restart after pulling the RAM, or Video Card you should have received some failed POST (Power On Self Test) errors. That you didn't points to EFI (holds POST info) chip or logic board.

You have RAM problems: If the computer detects no RAM (Random Access Memory) or the RAM installed does not meet the appropriate specifications, the screen will remain black but the power LED on the front of the computer will blink once per second to signal the error. This error condition may be due to physically damaged RAM, installing the incorrect type of RAM, or not having RAM installed. see: this Apple Support Article

Ok I had a little play around with the ram..... I have 2x 512mb originals. I also have 2x 2gb crucial ones and some more 512mb Kingston ones I took both ram risers out and tried the 2x2gb in slots 1 and 2 in top riser nothing happened but when I moved that down to bottom riser and left out the top riser card it seems to work!!!!!! What's that all about???? Lol also is it wise to run with only the one riser board in and on the lower slot?

Morning nick thanks for replying sadly I am unable to boot at all let alone reload the OS. Sadly I think machead3 might have given me the bad news I was expecting, but I have uploaded a video which might help diagnose the problem further.... See above link.

Back to you nick lol hopefully you can see the conversation with machead3 but it seems to be running on one riser board only in the bottom slot is this very bad to do or ok and is it the riser not working or top slot not working or the ram in those slots?

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